JPH079310Y2 - Cancel signal mechanism of turn signal switch - Google Patents

Description

[Detailed Description of the Invention] [Industrial application] The present invention relates to a turn signal switch (direction indicator) provided in an automobile or the like, and more particularly to a cancell mechanism for automatically returning an operating lever to a neutral position. .

[Conventional technology]

Various turn signal switches have been conventionally provided, and one example thereof will be described with reference to FIGS. 8 to 12.

FIG. 8 is an exploded perspective view showing a main part of the turn signal switch. In FIG. 8, 1 is a case attached to a steering cover (not shown), and 2 is a switch driving body housed in a recess 1a of the case 1. Reference numeral 3 denotes an operation lever which is connected to the switch driving body 2 and projects from the case 1. Reference numeral 4 denotes a cover which covers the recess 1a and is attached to the case 1.
The upper surface of the switch driving body 2 is provided with a planar triangular locking cam 5 and a stepped recessed groove 6, and blind holes 7 (one is omitted in the figure) at two locations on the peripheral surface. ) Has been drilled. Reference numeral 8 denotes a cam plate housed in the recessed groove 6 so as to be able to move forward and backward. The cam plate 8 is biased in the forward direction by a pair of springs 9 having a relatively large elastic force, and
The pair of pressing plates 10 screwed to the switch driving body 2 prevents the dropping from the concave groove 6. 11
Are drive bodies slidably fitted in the blind holes 7, and these drive bodies 11 are biased outward by the spring force of the spring 12.

A pair of chevron-shaped cams 13 are formed on the inner wall of the case 1, and the driving body 11 slides on the cam surfaces of the cams 13. Further, 14 is a cam body having a pair of protrusions 14a on the upper surface and one locking pin 14b on the lower surface.
Both ends of 4 are urged forward by tension springs 15 which are hooked on the cover 4. The protrusion 14a of the cam body 14
Is inserted into the arc-shaped guide hole 4a formed in the cover 4,
The locking pin 14b comes into contact with the mountain-shaped cam surface of the locking cam 5.

9 to 12 are plan views showing a state in which such a turn signal switch is attached to the steering device.
In these drawings, 16 is a steering shaft, 17 is a cancel cam that rotates integrally with the steering shaft 16 and has two protrusions 17a at 180-degree facing positions, and the case 1 has its front surface facing the cancel cam 17. Mounted on the steering device.

As shown in FIG. 9, when the operation lever 3 is in the neutral position, the cam body 14 is retracted against the tension spring 15 by the engagement of the engagement pin 14b on the lower surface with the top of the engagement cam 5, The protrusions 17a of the cancel cam 17 are located outside the locus of rotation. Therefore, even if the steering wheel (not shown) is rotated in such a state, the projection 17a of the cancel cam 17 does not contact the cam body 14, and the switch driving body 2 and the operating lever 3 are maintained in the neutral position.

Next, as shown in FIG. 10, when the operation lever 3 is rotated from the neutral position, for example, in the direction of arrow A, the upper drive member in the drawing (hereinafter, 11a for the upper drive member in the figure and the lower part in the figure for convenience of description). Since 11a (referring to the driving body 11b) rides over the mountain portion of the cam 13, the switch driving body 2 and the operating lever 3 are locked at that position, and the switch driving body 2 causes, for example, a switch for left turn (not shown). ) Is operated. Further, since the relative position of the locking cam 5 and the cam plate 14 is changed by the rotation of the switch driving body 2, the cam body 14 is moved by the tension spring 15 (8th
(See the drawing), the locking pin 14b moves from the top of the locking cam 5 to the inclined portion and projects to the front side of the case 1.

As shown in FIG. 11 from this state, when the steering wheel rotates backward to the original position (rotates in the direction of arrow B), the cam body 14 which is in the projecting state during the returning operation of the steering wheel is the projection of one of the cancel cams 17. It contacts with 17a. Then,
The cam body 14 rotates in the direction of arrow C with the lower protrusion 14a in the drawing as a fulcrum, and drives the cam plate 8. That is, since the cam plate 8 is connected to the switch driving body 2 via the spring 9 having a relatively strong spring force, the cam plate 8, the switch driving body 2 and the operating lever 3 are integrally formed to rotate clockwise in the figure. It rotates to and automatically returns to the neutral position shown in FIG. 9, and a so-called cancel operation is performed.

On the other hand, when the driver enters the return operation with the operation lever 3 fixed from the state shown in FIG. 9, that is, when the steering wheel returns to the neutral position by the caster effect, for example, the turn signal for left turn blinks. If you want to keep it, as shown in FIG.
Is brought into contact with one of the projections 17a of the cancel cam 17 which returns in the same manner as described above, and rotates in the direction of arrow C. In this case, since the operating lever 3 and the switch driving body 2 are fixed by the driver, the force acting on the cam plate 8 from the cam body 14 is absorbed by the contraction of the lower spring 9 in the figure, and The operation lever 3 is not canceled. And Kyansel Cam 17 is the 12th
When the steering wheel returns to the neutral position by further rotating in the direction of arrow B in the figure, the protrusion 17a of the cancel cam 17
Is separated from the cam body 14, and even if the driver releases his / her hand from the operation lever 3, the operation lever 3 remains locked in the state shown in FIG.

[Problems to be solved by the invention]

As described above, the turn signal switch is provided with a cancel mechanism for automatically returning the operation lever 3 locked in one direction to the neutral position when the steering wheel returns, but the cancel mechanism includes the operation lever. A safety function is required so that the cam body 14 is engaged with and disengaged from the cancel cam 17 while the 3 is locked.

Therefore, in the above-mentioned conventional example, in order to realize this, the function of connecting the cam plate 8 to the switch driving body 2 via the spring 9 having a relatively strong spring force is adopted. It is very difficult to manage the force with high accuracy, and the variation of the spring force of the spring 9 may hinder the cancel operation. That is, for example, if the spring force of the spring 9 is too strong, the force of the cam body 14 acting on the cam plate 8 cannot be absorbed by the spring 9 when the cancel operation is performed with the operation lever 3 fixed, and the cam plate cannot be absorbed. 8 or the cam body 14 may be damaged due to an unreasonable force. On the contrary, if the spring force of the spring 9 is too weak, the spring 9 undesirably contracts even during the cancel and the force of the cam body 14 is reduced. The transmission to the switch driving body 2 is not transmitted, and the cancel operation may become uncertain.

Also. As described above, the conventional cancell mechanism that requires the spring 9 requires a large number of parts, resulting in high cost. Further, the spring 9 having a relatively large spring force is compressed and the cam plate 8 and the switch driver 2 are compressed. Since it has to be installed in between, there is a problem in that the assembly work is complicated.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, to provide a reliable cancel operation, and to provide a cheap cancel signal mechanism for a turn signal switch that is easy to assemble.

[Means for solving problems]

The above-mentioned object of the present invention is to provide a switch driving body that rotates in conjunction with the operating lever, a driving body provided on the switching driving body through a spring, and a second driving body that cooperates with the driving body to operate the operating lever. A cam portion that can be locked to three positions of the first and second operating positions and a neutral position; and a cam body that is driven by a protrusion provided on the steering shaft.
And a cancel signal mechanism of a turn signal switch in which the operating lever locked to the second operating position is automatically returned to the neutral position by the cam body, in the switch driving body, the driving body is set to the spring. This is generally achieved by providing a slider that can be moved against and configured such that the slider is driven by the cam body.

[Action]

That is, according to the cancell mechanism of the turn signal switch as described above, the force of the cam body actuated by the projection of the cancell cam is transmitted to the driving body engaging with it through the slider, so that the driving body The switch driving body and the operating lever, which are locked by the engagement of the cam portion with the cam portion, are reliably and automatically returned to the neutral position.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is an exploded perspective view of a main part of a turn signal switch according to an embodiment of the present invention, FIG. 2 is a rear view showing a state in which a cam body is incorporated in a cover provided in the turn signal switch, and FIG. FIG. 8 is a plan view showing a state in which the turn signal switch is attached to the steering device.
The same reference numerals are attached to the portions corresponding to FIGS.

In these figures, reference numeral 18 is a slider having a pair of engagement holes 18a, and the slider 18 has its tongue piece 18b inserted into the recess 2a of the switch driving body 2.
Is placed on the upper surface of. Pins 23 projecting from the driving body 11 are respectively inserted into the engaging holes 18a of the slider 18,
These pins 23 are guide grooves 7a formed in the upper part of the blind hole 7.
You can move along. These guide grooves
7a extends substantially radially from the connecting portion between the switch driving body 2 and the operating lever 3, and one engaging hole 18a of the slider 18 is provided.
Are formed in a dogleg shape in the embodiment so as to partially overlap the guide groove 7a.

Reference numeral 19 denotes a cam body, and a first projection 19a and a second projection 19b are provided on the upper surface of the cam body 19 at predetermined intervals in the front-rear direction, and the lower surface thereof has the first projection 19a. Coaxial locking pin 19c
Is provided. Reference numeral 20 is a wire spring inserted into the cam body 19, 21 is a linear guide hole, 22 is a fan-shaped escape hole, and these guide hole 21 and escape hole 22 are continuously formed on the upper surface of the cover 4. ing. As is apparent from FIG. 2, the first projection 19a of the cam body 19 is in the guide hole 21 and the second projection 19b of the cam body 19 is the escape hole 22.
The cam body 19 is urged toward the front surface side of the case 1 by the spring force of the wire-working springs 20 which are respectively located inside and whose both ends are hooked by the cover 4. The remaining structure is basically the same as that of the conventional turn signal switch described above, and a detailed description thereof will be omitted here.

Next, the operation of this embodiment will be described with reference to the plan views shown in FIGS.

First, as shown in FIG. 3, when the operating lever 3 is in the neutral position, the cam body 19 retracts against the wire-working spring 20 because the locking pin 19c on the lower surface abuts on the top of the locking cam 5. The projections 17a of the cancel cam 17 that rotates integrally with the steering shaft 16 do not collide with the cam body 19. Therefore, even if the steering wheel is rotated in this state, the cam body 19 is not operated, and the operation lever 3 and the switch drive body 2 are
The neutral position is maintained by the contact of 11 with the valley of the cam 13 formed on the inner wall of the case 1.

Next, as shown in FIG. 4, when the operating lever 3 is rotated from the neutral position, for example, in the direction of arrow A, the driving body 11a at the upper side in the drawing is
Moves over the peak of the cam 13 against the spring 12 and moves to another valley, and the switch driving body 2 and the operating lever 3
Is locked at that position. When the switch driving body 2 rotates in this way, a switch (not shown) arranged below the switch driving body 2 is turned on, and, for example, a turn signal for left turn blinks. On the other hand, when the switch driving body 2 rotates as described above, the relative position between the locking cam 5 provided on the switch driving body 2 and the cam body 19 restricted by the cover 4 changes, so that the cam body 19 is locked. The pin 19c moves from the crest portion to the trough portion of the locking cam 5, and the cam body 19 partially protrudes from the front side of the case 1 by the spring force of the wire-working spring 20 (see FIGS. 1 and 2). To do.

In this state, as shown in FIG. 5, the steering shaft is
When 16 further rotates in the same direction as the operation lever 3 (the direction of arrow A), one of the projections 17a of the cancel cam 17 abuts against the projecting portion of the cam body 19 to drive it. Since the first projection 19a of the body 19 moves along the guide hole 21 and the second projection 19b moves along the upper slope of the escape hole 22 in the figure, the cam body 19 moves backward without contacting the slider 18. , The switch driver 2 and the operating lever 3 are the fourth
It is held in the locked state shown in the figure.

When the steering wheel returns to the original position by the caster effect from the state shown in FIG. 4, that is, when the steering shaft 16 rotates in the direction of arrow B as shown in FIG.
During the return operation, one of the protrusions 17a of the cancel cam 17 collides with the protruding portion of the cam body 19 to drive it. In this case, the first projection 19a of the cam body 19 has the guide hole 21
Since the second projections 19b move along the lower slopes of the escape holes 22 in the figure, the cam body 19 contacts the slider 18 and slides it downward (in the direction of arrow D) in the figure.
Then, when the slider 18 moves in the direction of the arrow D in this way, the pin 23 provided on the upper drive body 11a in the drawing moves the slider 18
Since it moves by contacting the end of the engaging hole 18a of the
1a retreats in the blind hole 7 against the spring 12, whereby the tip of the driving body 11a separates from the cam 13, and the switch driving body 2 and the operating lever 3 automatically return to the neutral position shown in FIG. To do. Further, when the switch driving body 2 is returned, the locking pin 19c moves to the top of the locking cam 5 again, so that the cam body 19 resists the wire-working spring 20 and is sunk into the case 1, and the cam body The engagement between 19 and the protrusion 17a of the cancel cam 17 is released.

On the other hand, when the driver enters the return operation with the operation lever 3 fixed from the state shown in FIG. 4, that is, when the steering shaft 16 rotates in the direction of arrow B in FIG. Is first moved to the position shown in FIG. 6 by one of the projections 17a of the cancel cam 17 to drive the slider 18 in the direction of arrow D,
The driver 11a retracts into the blind hole 7. Here, since the switch driving body 2 and the operating lever 3 are fixed by the driver, the first and second projections 19a and 19b of the cam body 19 are provided.
Moves back along the guide hole 21 and the escape hole 22 along the lower slope in the figure to the position shown in FIG.

In the present embodiment, the pin 23 provided in the lower driving body 11b in the figure during such a cancel operation moves to a portion where the dogleg-shaped engagement hole 18a is orthogonal to the guide groove 7a,
The drive body 11b hardly moves, and the load caused by the movement of the drive body 11b can be reduced.

When the projection 17a of the cancel cam 17 passes through the cam body 19, the cam body 19 is returned to the projecting state shown in FIG.
As a result, the state shown in FIG. 4 is restored, and the lock state of the switch driving body 2 and the operating lever 3 is maintained.

The above is the description of the case where the operation lever 3 is rotated in the direction of arrow A to blink the turn signal for left turn, for example, but the turn lever 3 is turned in the opposite direction to blink the turn signal for right turn, for example. In the case of making it do, the lower driving body 11b in the figure gets over the cam 13 and is locked, and thereafter the same operation as described above is performed. However, in this case, in the cam body 19 at the time of cancellation, the first and second projections 19a and 19b move along the upper slopes of the guide hole 21 and the escape hole 22 in the figure, and the slider 18 is opposite to the arrow D. Is moved in the direction.

In one embodiment configured in this way, the force of the cam body 19 driven by the cancel cam 17 can be directly transmitted to the drive body 11 via the slider 18, so that the drive body 11 and When the engagement / disengagement with the cam 13 is surely performed and the cancel operation is performed with the operation lever 3 fixed, the spring 12 compresses the load acting on the cancel cam 17, the cam body 19 or the slider 18. Can absorb,
A reliable cancel operation can be realized. Also, the slider 18
Since the drive body 11 and the spring 12 can be assembled into the case 1 in a state where they are blocked on the switch drive body 2, it is possible to prevent the drive body 11 from falling off during the assembly work.

Further, when the cancel operation is performed with the operation lever 3 fixed, the cam body 19 moves the first protrusion 19a through the guide hole 21 and the second protrusion 19b moves through either one of the escape holes 22. Therefore, the amount of movement of the slider 18 in this case can be suppressed, and the load acting on the cancel cam 17, the cam body 19, the slider 18, etc. can be reduced. Further, since the moving range of the cam body 19 is smaller than the conventional one,
Inexpensive wire spring 20 as elastic means for urging cam body 19
Can be used.

[Effect of device]

As described above, according to the present invention, since the driving body is operated by the slider driven in conjunction with the cam body, the cancell operation of the turn signal switch is reliable, inexpensive, and easy to assemble. A mechanism can be provided.

[Brief description of drawings]

1 to 7 relate to an embodiment of the present invention, FIG. 1 is an exploded perspective view of a main part of a turn signal switch, and FIG. 2 is a rear view showing a state where a cam body is incorporated in a cover, Third
FIG. 4, FIG. 5, FIG. 5, FIG. 6, and FIG. 7 are plan views showing the operation of the turn signal switch, and FIG.
FIG. 12 relates to a conventional turn signal switch, FIG. 8 is an exploded perspective view of a main part, and FIGS. 9, 10, 11, and 12 are plan views showing respective operations. 1 ... Case, 2 ... Switch driver, 3 ... Operating lever, 4 ... Cover, 5 ... Locking cam, 7 ... Blind hole,
7a …… Guide groove, 11 …… Drive body, 12 …… Spring, 13
…… Cam (cam part), 16 …… Steering shaft, 17 …… Cancel cam, 17a …… Protrusion, 18 …… Slider, 18a ……
Engagement hole, 19 ... Cam body, 19a ... First projection, 19b ... Second projection, 19c ... Locking pin, 20 ... Line work spring, 21 ...
… Guide holes, 22 …… escape holes, 23 …… pins.

Claims (1)

[Scope of utility model registration request] 1. A switch driving member that rotates in association with an operating lever, a driving member provided on the switch driving member via a spring, and the operating lever in cooperation with the driving member. The second locking position includes a cam portion that can be locked in three positions, namely, a neutral position and a cam body that is driven by a protrusion provided on the steering shaft, and is locked in the first and second operating positions. In a cancel signal mechanism of a turn signal switch in which an operating lever is automatically returned to a neutral position by the cam body, the switch drive body is provided with a slider capable of moving the drive body against the spring. A cancell mechanism for a turn signal switch, characterized in that a slider is driven by the cam body.